Posts in 2024
  • 25GBit/s on macOS & iOS

    Friday, May 17, 2024 in Blog

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    macOS speed test Your browser does not support the video tag. iOS speed test Your browser does not support the video tag. Background info Modern versions of macOS and iOS (starting with macOS Ventura/13) ship with NVIDIA/Mellanox ConnectX network …

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Posts in 2023
  • Manage RDP certificates on Windows using SSH

    Friday, December 15, 2023 in Blog

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    Windows can use normal TLS certificates to authenticate RDP sessions. This gets rid of the annoying RDP certificate warnings: Using real, signed certificates for RDP offers a way to enhance security (preventing man-in-the-middle attacks) and reduce …

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  • Reviving a dead Gigabyte MJ11-EC1 mainboard

    Thursday, November 16, 2023 in Blog

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    Used Gigabyte MJ11-EC1 mainboards are available for low prices on ebay and at other hardware vendors. After buying a couple of MJ11-EC1 boards for a homelab cluster project, I ended up with a dead board. The server would turn on, BMC was reachable …

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Posts in 2022
  • Dead TROTEC PAC2000S air conditioner

    Wednesday, August 24, 2022 in Blog

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    Safety note The A/C is being powered by a ST VIPER12A switch mode supply. This type of supply is not mains-isolated, so all voltages (even the low voltages) are referenced to mains voltage. Don’t work on this device while plugged in without …

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Posts in 2021
  • PlutoSDR standalone ADS-B FR24 feeder

    Wednesday, December 01, 2021 in Blog

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    PlutoSDR (or ADALM-PLUTO) is an inexpensive SDR (software-defined radio) platform by Analog Devices. It uses a Xilinx Zynq Z-7010 FPGA, which integrates an 32bit ARMv7 core together with the FPGA functionality. This 32bit ARMv7 CPU runs Linux and is …

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Posts in 2020
  • Micro8088 build log

    Thursday, October 29, 2020 in Blog

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    Overview This is a build log of an IBM XT-compatible system called “Micro 8088”, designed by Sergey Kiselev. micro8088 CPU card specifications: NEC V20 CPU (4.77 MHz, 7.16 MHz and 9.54 MHz CPU frequencies) Faraday FE2010A chipset 640 KiB …

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  • OpenWRT als WireGuard-Appliance

    Sunday, June 21, 2020 in Blog

    Language note This post was written in a hurry at the start of the Covid-19 pandemic in 2020 as a way to get people (and their offices) usable for remote work quickly. This is also the reason why it’s written in German language. Some of the …

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Posts in 2019
  • GPS locked Raspberry Pi

    Sunday, June 23, 2019 in Blog

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    For highly-accurate timekeeping or signal generation with a Raspberry Pi, it’s possible to replace the on-board crystal with an external reference input. On the Raspberry Pi 1 the main system oscillator is a 19.2 MHz quarz crystal. In order to …

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  • Es'hail-2 transceiver setup

    Saturday, April 27, 2019 in Blog

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    QO-100, also known as Es’hail-2 is a geostationary amateur radio satellite. It can be used by large parts of the world, including Europe, Africa, (parts of) South America and Asia. The satellite works as a linear transponder. It receives a …

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  • ThinkPad PowerSeries 820

    Tuesday, April 23, 2019 in Blog

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    One of the rarest ThinkPads is the ThinkPad PowerSeries 820, running a Power PC 603e at 100 MHz. It’s code name is Wiltwick, the type designator (used in Windows) is 6040. It uses an 800x600 TFT, WD90C24A/G10 graphics and has a 1.2 GB SCSI HDD. …

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